production. In addition, ocean warming is leading to changes in the winter mixed layer in the North Atlantic, which has reduced the amount of silica entering the Arctic Ocean in recent decades. This will [...] the consequences of silica decline for the Arctic marine ecosystem and the mechanisms responsible. To understand how climate change affects the Arctic Ocean, we will combine novel and classical approaches [...] Group Silicic acid Decline Effect on Marine Arctic Ecosystems SideEFFECT (Graphic: Mar Fernández-Méndez) Human-induced climate change is altering the ocean on a previously unimaginable scale. One of the